Q24 of 48 Page 9

Which of the following statements is not correct?

Not all metal oxides are insoluble in water. Some metal oxides such as Na2O and CaO dissolve in water to form alkalis. When Na2O reacts with water, NAOH is formed.


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22

Which of the following is not a mineral acid?

 23

Which among the following is not a base?

 25

Match the chemical substances given in column I with their appropriate application given in Column II.























Column I



Column II



A. Bleaching powder



1. Preparation of glass



B. Baking soda



2. Production of H2and Cl2



C. Washing soda



3. Decolourisation



D. Sodium chloride



4. Antacid



Codes


A B C D A B C D

 26

Equal volumes of hydrochloric acid and sodium hydroxide solution of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in figure of NCERT Book (Science Class X) on page 26).